题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220233-46838.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220233-99514.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220233-32393.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220233-88765.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-73017.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-42929.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-36036.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-60891.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-89552.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-48561.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-39649.gif)
得分得分
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-17923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-36399.gif)
现分析粒子运动的轨迹.如图所示,在
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-73017.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-48561.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220235-78534.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220235-10449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220235-50710.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220235-57008.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220236-79405.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-39649.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220236-26399.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220236-52656.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220236-80710.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220237-69512.gif)
此后,粒子每经历一次“回旋”(即从
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220235-10449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-48561.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-39649.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220235-10449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220235-10449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220237-44421.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220233-32393.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220235-10449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220237-20200.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220237-18522.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220238-55134.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220238-89868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220238-21561.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220233-32393.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220238-44676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220233-32393.gif)
联立①②⑤式可得
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-42929.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220234-36036.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220233-99514.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220233-32393.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220239-63149.jpg)
核心考点
试题【如图所示,在x<0与x >0的区域中,存在磁感应强度大小分别为B1与B2的匀强磁场,磁场方向均垂直于纸面向里,且B1>B2。一个带负电荷的粒子从坐标原点O以速度】;主要考察你对粒子在有界磁场中运动等知识点的理解。[详细]
举一反三
(1)若平行板电容器C的板长为
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220225-28090.gif)
(2)用U、B、L表示出电子的比荷;
(3)在磁场区域再加一匀强电场,其电场强度的大小为
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220225-47386.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220225-29697.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220213-46579.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220213-84883.jpg)
(1)带电粒子经多长时间第一次与DE边相碰?
(2)带电粒子速度v的大小取哪些数值时可使S点发出的粒子最终又回到S点?
(3)这些粒子中,回到S点所用的最短时间是多少?
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220206-60080.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220206-73335.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220207-82322.gif)
(1)P
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220206-73335.gif)
(2)粒子从P运动到
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220206-73335.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220207-96999.jpg)
(1)在图上画出两粒子的运动轨迹;
(2)求v1:v2;
(3)求t1:t2。
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220157-34853.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114220153-33313.jpg)
A.从两孔射出的电子速率之比为![]() |
B.从两孔射出的电子在容器中运动所用时间之比为![]() |
C.从两孔射出的电子在容器中运动时的加速度大小之比![]() |
D.从两孔射出的电子在容器中运动时的加速度大小之比![]() |
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